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Pin descriptions
Pin name
Descriptions
Analog input
Analog input
Analog ground
Voltage
reference
input.
Normally
connected
to V777?.
Chip select. Active LOW logic input.
When this input is LOW, this device is
selected.
6
CONVS
Conversion start. When this input is
switched from LOW to HIGH, the track
hold goes into the hold mode, starting
conversion.
CONVST input is asynchronous with
CLKIN, and independent from CS and
RD.
Read. Active LOW logic input. This input
is used
to enable the data output when
CS becomes LOW.
Active LOW logic output. This signal
indicates
the convertor
state.
BUSY
becomes LOW during conversion.
@ Lvc (SC3611)
1) Brief functional description
LCD driver power control
Input potentiometers, VR1~VR8, perform D/A conversion to set up
'output voltages V1, V3-V6 that controlled by VCC input line and on
and off of the VEES output.
2) Block diagram
CTRL
OIS
VEE VEES RIN1
V1
V6
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{18
17|_
|16}
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|
Bias,
sw
iN
[/
a=
} RES
|
DIA
pt]
eels
Bae
9
CLKIN
Clock input. TTL-compatible logic input.
Used as the clock signal source for the
A/D convertor. The mark/space ratio of
this clock signal is in the range of 40/60
~ 60/40.
80-0811
Digital ground
3-state data output. When CS and RD
become LOW at the same time, this
signal becomes active.
MODE
MODE input. Used to set the device to
the
power
save
mode.
(When
MODE=OV, the power save mode.) At
logic
HIGH
(MODE=V??),
normal
operations.
Power voltage. Rated value +5V.
vec
3) Pin description
VAI
VR1~VR8
+ ae I Fe Fea
(S|
I
|
Waa
Gl wl GE
el bd
VR2
VR3
VR4
VRS
VR6
VR7
VR8
GND
$C3611 block diagram
As an 8-bit digital value is set with
VR1 set to SB and VR8 to MSB,
the LCD drive voltage is controlled.
(Control input)
11-15
V1, V3-V6
OUT
2
11
==
4
=
v3
ig Vt
4g V1 V6
(LCD power supply line)
Using the bias current setting, the
output capacity is controlled by V1,
V3~V6. (Bias line)
Source power supply to issue the
LCD power supplies V1, V3-V6.
(LCO power supply input)
VEE is produced when VCC(SW) is
at a high
and
high
impedance
when VCC(SW) is at a low.
Same voltage as V1. It has no
buffer function. (Bias line)
Output discharge control. Not used.
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